Browsing by Author "Tzou, YY"

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A CPLD-based voltage/current vector controller for 3-phase PWM inverters
(1998)
Jyang, JY
;
Tzou, YY
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents the design and implementation of a vector control IC using complex programmable logic device (CPLD). A vector oriented control structure using integer arithmetic has been developed for the voltage or current regulation of 3-phase PWM inverters. This vector control IC can he used for the voltage or current control of a 3-phase PWM inverter using a vector command with specified amplitude, frequency, and phase. It has four operation modes: voltage or current control in either stationary or synchronous reference frame. This vector control IC is designed as a co-processor for a general-purpose microcontroller used for sc motor control and 3-phase power supplies. This vector control IC is realized with a 10-bit data bus and employs about 40 thousands logic gates of a CPLD (FLEX 10K 100) from Altera eo. The sampling rate can be programmed up to 50 kHz. Simulation and experimental results are given to illustrate the performance of the designed vector control IC.
A novel current-injected sensorless control scheme for squirrel-cage induction motors
(2002)
Lin, SY
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Tzou, YY
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電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents a novel sensorless control scheme of squirrel-cage induction motors by using a PWM waveform injection technique for the estimation of rotor dependent stator leakage inductances. To increase the signal-to-noise ratio when operating in low-speed region, the magnitude of the injected signal is adaptively adjusted according to motor operating condition. Practical realization issues of the detection of the reflected signals and estimation of the rotor position have been addressed. The developed sensorless control scheme has been implemented by using a high-performance single-chip DSP controller. Experimental verification of the developed adaptive injection scheme and rotor position estimation scheme has been carried out. Experimental results show the proposed sensorless position control scheme can reach a position control resolution of 0.05 rad with a rated holding torque.
A three-phase PWM AC-DC converter with low switching frequency and high power factor using DSP-based repetitive control technique
(1998)
Jung, SL
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Huang, HS
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Tzou, YY
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents a novel digital control scheme for PWM AC-DC converters with low switching frequency used in high-power applications. The proposed scheme incorporates an inner current loop with an outer voltage loop to improve input power factor and regulate the output de-link voltage. The inner current loop consists of a predictive controller and a repetitive controller. The outer voltage loop is composed of a digital IPI controller and a load current compensator. A PWM AC-DC converter employing DSP control has been constructed to verify the proposed control scheme. A nearly unit input power factor can be achieved even with a low switching frequency. Experimental results confirm the feasibility and features of the proposed repetitive control scheme for unit power factor regulation.
A transputer-based adaptive speed controller for AC induction motor drives with load torque estimation
(1997-03-01)
Tsai, MF
;
Tzou, YY
;
交大名義發表
;
電控工程研究所
;
National Chiao Tung University
In this paper, we design and implement an adaptive speed controller that can estimate load torque for ac induction motor drives employing a transputer-based parallel processing technique, The adaptive speed controller, which precedes the held-oriented control loop, consists of a two-degree-of-freedom controller and a feedforward load-torque compensator, The two-degree-of-freedom controller is designed by a pole-placement technique with polynomial manipulations. Its parameters are adjusted adaptively in terms of estimated model parameters, Estimating the model parameters entails a second-order least-squares estimator with constant trace to avoid estimator windup. The design of the feedforward compensator is based on an estimated load-torque model, Estimating the load torque entails a first-order least-squares estimator with variable forgetting factor and covariance resetting, the purposes of which are to detect any slow or sudden changes of torque disturbance, respectively. The resulting adaptive controller is implemented in parallel by IMS T800-20 transputers, Experimental results demonstrate the robustness of the proposed control method in contending with varying load and torque disturbance.
A transputer-based parallel controller for motor control applications
(1997-10-01)
Tsai, MF
;
Tzou, YY
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents the design and implementation of a parallel controller based on the transputers IMS T800-20 for high-performance motor control applications. A unified controller architecture comprising transputer-based parallel computing boards and input/output boards suitable for the real-time control of various types of motor drives is proposed. The system can increase its computing and input/output processing capability by paralleling these boards. A host server based on a personal computer for user interface is also developed. To demonstrate the system's capability, we have applied the system to the fully digital adaptive control of an AC induction servo motor. The control functions can be easily implemented in parallel by using the high-level programming language Occam. The comparison with two existing parallel controllers also shows the performance and architectural features of the system. (C) 1997 Elsevier Science B.V.
Adaptive repetitive control of PWM inverters for very low THD ac-voltage regulation with unknown loads
(1999-09-01)
Tzou, YY
;
Jung, SL
;
Yeh, HC
;
電控工程研究所
;
Institute of Electrical and Control Engineering
An adaptive repetitive control scheme is proposed and applied to the control of a pulsewidth-modulated (PWM) inverter used in a high-performance ac power supply; The proposed control scheme can adaptively eliminate periodic distortions caused by unknown periodic load disturbances in an ac power supply, The proposed adaptive repetitive controller consists of a voltage regulator using state feedback control, a repetitive controller with tuning parameters, and an adaptive controller,vith a recursive least-squares estimator (LSE), This adaptive repetitive controller designed for ac-voltage regulation has been realized using a single-chip digital signal processor (DSP) TMS320C14 from Texas Instruments, Experimental verification has been carried out on a 2-kVA PWM inverter. Simulation and experimental results show that the DSP-based adaptive repetitive controller can achieve both good dynamic response and low total harmonic distortion (THD) under large-load disturbances and uncertainties.
An adaptive current control scheme for high-performance AC drives
(1997)
Tsai, MF
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Tzou, YY
;
資訊工程學系
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Department of Computer Science
In this paper, a self-tuning adaptive current controller for high-performance sc drives is presented. The adaptive current controller, which operates in the stationary two-axis frame to provide the persistently exciting condition for parameter estimation convergence, consists of an one-step-ahead predictive controller and a model estimator. The predictive controller's parameters are adjusted adaptively on line in terms of estimated model parameters. Estimating the model parameters entails a first-order four-dimensional least-squares estimator with exponential data weighting to detect the variations of the motor parameters and the back emf. The proposed adaptive control scheme is implemented in parallel by IMS T800-20 transputers. Simulation results show the effectiveness of the proposed adaptive current control scheme.
Analysis and design on the reduction of DC-link electrolytic capacitor for AC/DC/AC converter applied to AC motor drives
(1998)
Chien, WS
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Tzou, YY
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電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents the design of a three-phase quasi-direct ac/dc/ac converter with minimum energy storage in the de-link capacitor. The proposed digital control scheme can achieve unit power factor, lower current distortion on the utility side, and fast response to de-link voltage regulation. A power balancing control scheme is used to minimize the required DC-link capacitor. The design procedure of the proposed method, accompanied with given simulation results, has been described.
ASIC implementation of a programmable servo control IC with digital phase-locked loop
(2002)
Cheng, KY
;
Wang, CY
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Tzou, YY
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents a new application-specific integrated circuit (ASIC) realization of a programmable servo control IC for high-performance BLDC spindle motors. The advantage of ASIC technology is that the design is specific to the application and can be optimized by designers. In order to achieve precise speed regulation without high-resolution encoder feedback, a digital phase-locked loop is implemented in the proposed servo control IC. Furthermore, by incorporating the proposed servo control IC with a general-purpose microprocessor or digital signal processor (DSP), a simple, yet high performance solution can be achieved. Simulation and experimental results indicate that precise speed regulation of BLDC motors can be achieved with the proposed servo control IC.
Auto-tuning control of self-commissioning electric drives
(1997)
Tzou, YY
;
Lin, YF
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電控工程研究所
;
Institute of Electrical and Control Engineering
This paper proposed a new ante-tuning self-commissioning (ATSC) control scheme for the positioning control of a dc drive for general-purpose servo applications. The ATSC controller consists of three major parts: a basic servo controller (BSC), an auto-tuning controller (ATC), and a self-commissioning controller (SCC). The proposed ATC is a generalized two-degree-of-freedom auto-tuning controller, it can be used to tune any two parameters of a controller without knowing its detailed control algorithm. The proposed ATSC control scheme has been applied to a dc drive for verification, Simulation and experimental studies of the ATSC dc drive have also been given.
Auto-tuning self-commissioning control of a universal drive
(1998)
Tzou, YY
;
Wu, H
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Lin, SY
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Lin, JY
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電控工程研究所
This paper presents a systematic design procedure for the auto-tuning self-commissioning (ATSC) control of a universal drive. The ATSC controller consists of five major parts: a current vector controller (CVC), a field-oriented vector controller (FVC), a servo loop controller (SLC), a self-commissioning controller (SCC), and an auto-tuning controller (ATC). The developed universal drive can be programmed to operate as a general-purpose adjustable speed inverter drive, a vector-controlled sensorless induction drive, a de servo drive, a permanent-magnet sc servo drive, or an induction servo drive. The concept and architecture for the future development of universal drives are studied in this paper. We also illustrate some experimental studies of the developed universal drive in application to the ATSC control of an induction motor with unknown motor parameters.
Design and implementation of a real-time identification system using parallel processing technique for adaptive control of a DC motor drive
(1995)
Tsai, MF
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Tzou, YY
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電控工程研究所
;
Institute of Electrical and Control Engineering
Design and implementation of a real-time lossless dynamic electronic load simulator
(1997)
Chang, MY
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Lin, JY
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Jung, SL
;
Tzou, YY
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交大名義發表
In this paper, the construction of a new power electronics instrument, dynamic electronic load simulator (DELS), is presented. A high-performance full-bridge power amplifier with two-stage output filter and 50 kHz snitching frequency is designed for high bandwidth current loop requirement. The control of the proposed DELS mainly consists of an inner current controller and an outer load-model controller (LMC). Through the simulation and experiments, it is verified that the proposed DELS can replace a heap of RLC power components, exhibit the load behavior approximately and save a large amount of energy during burn-in test.
Design and implementation of an FPGA-based control IC for AC-voltage regulation
(1999-05-01)
Jung, SL
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Chang, MY
;
Jyang, JY
;
Yeh, LC
;
Tzou, YY
This paper presents a field-programmable gate array (FPGA)-based control integrated circuit (TC) for controlling the pulsewidth modulation (PWM) inverters used in power-conditioning systems for ac-voltage regulation, We also propose a multiple-loop control scheme for this PWM inverter control IC to achieve sinusoidal voltage regulation under large load variations. The control scheme is simple in architecture and thus facilitates realization of the proposed digital controller for the PWM inverter using the FPGA-based circuit design approach. Bit-length effect of the digital PWM inverter controller has also been examined in this paper. The designed PWM inverter control IC has been realized using a single FPGA XC4005 from Xilinx, Inc., which can be used as a coprocessor with a general-purpose microprocessor in application of ac-voltage regulation. Owing to the high-speed nature of FPGA, the sampling frequency of the constructed IC can be raised up to the range that cannot be reached using a conventional digital controller based merely on microcontrollers or a digital signal processor (DSP), Experimental results show the designed PWM inverter control IC using the proposed control scheme can achieve good voltage regulation against large load variations.
Design and implementation of an FPGA-based control IC for the single-phase PWM inverter used in an UPS
(1997)
Jung, SL
;
Chang, MY
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Jyang, JY
;
Huang, HS
;
Yeh, LC
This paper presents an FPGA-based multiple-loop control scheme for the regulation of the PWM inverters used in UPS. The proposed control scheme incorporates an inner current loop with an outer voltage loop to regulate the output voltage of the PWM inverter, which is expected to be sinusoidal. The corresponding control gains are designed through deadbeat theory so that the inverter can achieve fast dynamic response. An output voltage decoupling mechanism and a load disturbance compensation scheme have been proposed to improve the stiffness of the controlled PWM inverter. The developed digital controller has been realized by a RAM-based FPGA XC4010 to verify its effectiveness. The simulation and experimental results show that the output voltage of the controlled PWM inverter has good transient response and little distortion under rough load conditions.
Design and implementation of an FPGA-based motor control IC for permanent magnet AC Servo motors
(1997)
Tzou, YY
;
Kuo, TS
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電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents the design and implementation of a motor control IC for permanent magnet ac (PMAC) servo motors using the field programmable gate array (FPGA). This paper develops a hardware architecture for the digital control of PMAC servo motors. The proposed control structure has also been realized using FPGAs from Xilinx Inc. All the control functions, including the PWM waveform generation, current control, vector control, velocity control, and position control have been realized using FPGA based programmable logic gates. The constructed PMAC control IC includes 25,000 logic gates and is realized using 8-bit integer arithmetic, Experimental results are given to verify the PMAC control IC.
Design of a sensorless commutation IC for BLDC motors
(2002)
Cheng, KY
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Lin, YT
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Tso, CH
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Tzou, YY
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電控工程研究所
This paper presents the design methodology to implement a sensorless commutation IC for brushless dc (BLDC) motors by using mixed-mode IC design technology. The developed IC can generate optimal commutation signals for BLDC motors without Hall-effect sensors and can be easily interfaced with a microcontroller or a digital signal processor (DSP) to complete the closed-loop control system. Furthermore, this IC solution requires less analog compensation circuits than other commercial motor control ICs, therefore, high maintainability and accurate control can be achieved. The proposed sensorless commutation IC is integrated in a standard digital single-poly, and four metal 0.35-mum CMOS process.
Design of a sensorless commutation IC for BLDC motors
(2003-11-01)
Cheng, KY
;
Tzou, YY
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents the design and realization of a sensorless commutation integrated circuit (IC) for brushless de motors (BLDCMs) by using mixed-mode IC design methodology. The developed IC can generate accurate commutation signals for BLDCMs by using a modified back-EMF sensing scheme instead of using Hall-effect sensors. This IC can be also easily interfaced with a microcontroller or a digital signal processor (DSP) to complete the closed-loop control of a BLDCM. The developed sensorless; commutation IC consists of an analog back-EMF processing circuit and a programmable digital commutation control circuit. Since the commutation control is very critical for BLDCM control, the proposed sensorless commutation IC provides a phase compensation circuit to compensate phase error due to low-pass filtering, noise, and nonideal effects of back-EMFs. By using mixed-mode IC design methodology, this IC solution requires less analog compensation circuits compared to other commercially available motor control ICs. Therefore, high maintainability and flexibility can be both achieved. The proposed sensorless commutation IC is integrated in a standard 0.35-mum single-poly four-metal CMOS process, and the realization technique of this mixed-mode IC has been given. The proposed control scheme and developed realization techniques provide illustrative engineering procedures for the system-on-a-chip solution for advanced digital motor control. Simulation and experimental results have been carried out in verification of the proposed control scheme.
Digital control of a single-stage single-switch flyback PFC ac/dc converter with fast dynamic response
(2001)
Feng, YT
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Tsai, GL
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Tzou, YY
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電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents the DSP control of single-stage single-switch (S4) flyback ac-dc converter with fast output voltage regulation. Active current shaping technique using flyback ac-to-dc converter has been employed for the power factor control and dc voltage regulation. The proposed control scheme possesses the following characteristics: high power factor, fast regulation of the output dc voltage, high efficiency, low cost, galvanic isolation, and the most important is that all the control functions are realized by using software control which provides great flexibility for system modification and applications. An adaptive voltage ripple estimator has been proposed to compensate the measured dc-link voltage ripples. The proposed control scheme for the S4-PFC flyback converter was realized by using a single-chip DSP controller. Simulations and experimental results have been given to illustrate the performance of the implemented DSP-controlled PFC converter.
Discrete sliding-mode control of a PWM inverter for sinusoidal output waveform synthesis with optimal sliding curve
(1996-07-01)
Jung, SL
;
Tzou, YY
;
交大名義發表
;
電控工程研究所
;
National Chiao Tung University
This paper presents a discrete sliding-mode control scheme with feedforward compensation for the closed-loop regulation of the pulse-width modulated (PWM) inverter used in an uninterruptible power supply (UPS), The proposed feedforward controller can effectively improve the tracking performance of the PWM inverter, In designing the sliding-mode controller, we have taken Load disturbance into consideration to enhance the robustness of the PWM inverter, Moreover, the upper bound of the load disturbance under which the sliding condition can be maintained has also been derived, The sliding curve of the sliding-mode controller is designed such that the behavior of the controlled PWM inverter is optimal subject to the selected cost function, Due to the coordinate transformation proposed in this paper, only the output voltage needs to be measured as feedback for the purpose of closed-loop regulation, Simulation and experimental results are given to show the effectiveness of the proposed control scheme.